johnm1 wrote:
Oh ... I'm sure there's fun to be had by all ... as long as the beer is cold and we don't run out!
Back to the converter question please ...
Do I "need" a 75A converter even if I end up adding a 2nd battery or is a smaller (lower) power one OK?
Two group 24 deep-cycle batteries (not yours) would be best mated with a 30 to 45 amp 3-stage charger. Otherwise; the charger will sense a smaller battery and never go into "bulk charging" mode.
The idiot hired by your manufacturer knew little about charging systems. I suspect the cabling used is nowhere near a heavy enough gauge for proper operation. In this case "bigger is NOT better" when taking into account; charger capability, battery-bank size, and required cable gauge size for proper operation.